Improvement in making bolts



Nrrnn 'raras Aralar time.

DAVID E. ADAMS, 0F ALLEGHENY CITY, PEJNSYIJVANIA.

' IMPROVEMENT iN MAKING BOL-rs.

Specification forming part of Letters Patent NO. 58,0110, datedSeptcniiser 1S, 1866.

To all 'whom 'it may concern:

Be ity known that I, DAVID E. ADAMS, of the city and county ofAllegheny', and State of Pennsylvania, have invented a new and usefulImprovement in Bolt-ll/Iachines; and I do hereby declare the followingto be a full and exact description thereof, reference being had to theaccompanying drawings, and to the letters ot' reference marked thereon.

The nature of my invention consists in stav. ing up or enlarging andforming into an oval or elliptic form (when viewed in cross-section)that part ot' the rod of iron intended for the head and square of theneck of bolts having square necks, said staving or enlarging into saidoval or elliptic form being done previous to the formation of thesquaring ot' the neck and forming of the head ot' the bolt, whichsquariug and heading are performed at a subsequent operation.

My invention also consists in providing boltmachines with dies formed insections and furnishing said dies with strippers for removing the boltVfrom the dies, the whole being constructed, arranged, and operating inthe manner hereinafter described.

To enable others skilled in the art to make and use my invention, I willproceed todescribe its construction and operation.

In the accoinpanyingdrawings, Figure l rep resentsan isometricperspective view of my improved bolt-machine. Fig. 2 represents atransverse section ofthe same, cut through at line marked l() in Fig. 1.Fig. 3 represents the manner lof placing the staved or enlarged part otthe iron in the dies for forming the square on the neck of the bolt.Fig. 4 repre sents the iron for forming the bolt after said iron hasbeen sta-ved or enlarged into the desired form for squaring it for theneck and for forming the head ot' the bolt. Fig. 5 represents the oldcylindrical form ot" staved iron placed in dies previous to beingsquared, said tgure being used for illustration.

Figure l in the drawings represents an .ordinarybolt or rivet machine. Arepresents the frame; B, the bearings for the shaft c, which isfurnished with cams C` and D. g represents the lever for operating thepiston fz', in which is placed a plunger, g/,which in form and sizecorresponds t0 the form size, and enlargement made on the rod fuilforming the neck and head of the bolt. J represents the support andguide of the plunger 7 and S represent set-screws, whiclrare used forregulating the position of the shaft of the clamp ing-jaw l and bearingof the lever g. h represents the lever used for operating theclamping-jaw l, in which is placed one halt of the die which is used forholding' and forming the iron into the desired shape. The other halt'ofthe die is placed in the stationary head 7c. Each half of the die ismade in two sections, marked o and p. The part of the die marked p has arecess, 2, made in it. for the tongue a of the strippers m and a, whichare secured to the pieces marked It, which are used for holding the diesin their proper place. The part ofthe die, marked p, is iliade so thatit clamps around the rod of iron from which the bolt is to be formed,and holds it firmly, and the part marked 9 is made so that it will, inconnection with the plunger, marked y, form the oval or ellipticenlargement on the rod. marked 9 in Fig. et represents the rod which isheld by the part of the die marked p, and the' part marked S in the samefigure is the enlarged or staved part, which is formed in the part ofthe die marked 0.

The advantages ot' making the die in sections will readily beunderstoodby stating that it is often necessary to change the length and thicknessofthe neck of the bolt without changing the size or gage of iron in theshank or screw part of the bolt. This change in the neck ot' the beltcan be made by simply removing the part ofthe die marked o and supplyingits place by a part of'larger size.

Another advantage gained by making the die in section is ease ot'construction. This will be readily seen and understood by the mechanicwithout further description.

The operation of my improvement in conA iiection with the bolt-machineherein represented is as follows: Power is applied to -the shaft e, andthe cam C will operate the lever la by its action on the friction-rollert, and cause the clampjaw t to close the dies o and p upon the rod ofiron fed into the dies, and at the same time cut olf that part in thedie from the rod by means of the cutter a' which is secured to theclamping-jaw l. The cam D then comes The part in contact with thefriction-roller f of lever g and moves said lever forward, whichmovement of the lever g will move forward the piston fi and its plungery, which will enter the cavity 4 in the sections o of the die and forceor stave back the iron so as to form the enlargement desired. rlhe leverg is then drawn back by a spring, and the clamping-jaw falls by its owngravity and opens the dies, and the strippers m and n will cause theformed iron to leave the die and drop down into a suitable vesselprovided for that purpose.

Experience has demonstrated the fact that it is ahnostilnpossible toform a perfect square neck on bolts by machinery when the stavedup orenlarged part of the iron is made in a cylindrical form. Now, toovercome this diiiculty, I make the staved or enlarged part of the ironfor the bolt oval or elliptic in form, and place said form in the diesfor the squaring or heading process, so that the plane of the longdiameter of the oval or ellipse will come in the corners or angles ofthe die, as

shown in Fig. 3, and thereby cause the pressnre of the die to so act onthe iron that the lines of pressnre'on the iron will diverge toward theother two corners or angles of the dies and form a perfect square.

Having thus described the nature, construction, and operation of myimprovement, what I claim isy Staving up or enlarging and forming intoan oval or elliptic form (when viewedin crosssection) that part of therod of iron intended for the head and square of the neck of bolts, saidstaving or enlarging into said oval or elliptic form being done previousto the formation of the squaring of the neck and forming of the head ofthe bolt, which squaring and heading are performed at a subsequentoperation.

DAVID E. ADAMS.

Witnesses JAMES MOBRIDE, ALEXANDER H-AYs.

